Alarm clock



FIG. 1 is a front elevational view of an alarm clock showing my new design;

FIG. 2 is a front, right side, and top perspective view thereof;

FIG. 3 is a right side view thereof;

FIG. 4 is a rear elevational view thereof; and,

FIG. 5 is a rear, right side, and top view thereof. 

The ornamental design for an alarm clock, as shown and described. 